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SPF vs. DKIM
DomainKeys Identified Mail (DKIM)
Merger of Yahoo! DomainKeys and Cisco’s IIM
RFC-2822 layer, or, Header Layer protocol
Validates an accountable identity associated with a message when it is transferred over the Internet
Cryptographically signs the email body and some of the headers
Domain public key stored in DNS TXT record under _domainkey subdomain